Creating reference numbers on form submissions

I use the form as a contact form on my website to capture client info and enquiry. I reference each enquiry with a number to make it easy for me to find later when the enquiry has converted into a booking. eg, #1234 #1235 #1236
I would like there to be a way of automatically adding the number or unique reference, when someone completes the form, rather than me manually entering a number into a column post submission. (which leads to human error as I have duplicated it many times.)

Hey @Thomasin! Would The Item ID Column or The Auto Number column be relevant for you here? Alternatively, there is AutoID Column (/app) which might be more customisable for you.

Please let me know your thoughts!